When not computing centroids, choose the number of nearest neighbors to use when summarizing distances to each observation, just like K-Nearest Neighbors.Only the K smallest distances are used to predict an observation. A value of zero (0) corresponds to using all distances.
Tip: To change the scale of the slider, right-click on the slider and select from the pop-up menu. Change the upper and/or lower boundaries in the window that appears, to rescale the slider and click .